Nokia 6235 Troubleshooting Manual

Also see for 6235: User guide User guide User guide Disassembly/Assembly Antenna Description and Troubleshooting

Contents

Nokia 6235 Troubleshooting Manual Manual pdf 19 page image

Nokia Customer Care RF Description and Troubleshooting6235/6235i/6236i (RM-60)Issue 1 04/2005 ©2005 Nokia Corporation Company Confidential Page 194. Use an AAS-10 RF probe to probe the Cell Tx output of the N7000.• If there is no RF or low RF, look for SMD everywhere around the N7000.• If the SMD is okay, replace the N7000.5. Probe the PA input.• If the level is low, look for an SMD issue on the Tx filter or matchingtransformer (T7001 or T7002).• Reflow or replace the filter as necessary.6. Probe the PA output.• If the RF is missing or low, look for Vbatt voltages and SMD issues on andaround the PA.• If these are okay, replace the PA.7. Probe the duplexer output.• If the RF is missing or low, reflow or replace the duplexer.8. Probe the coupler output.• If the RF is missing or low, reflow or replace the coupler.9. Probe the diplexer output.• If the RF is missing or low, reflow or replace the diplexer.Failed Test: Tx PA DetectorUse the following steps if you encounter a failed test for the Tx PA detector:1. Use Phoenix to set the mobile terminal into Local Mode and activate the Tx withdefault output power.2. The output power at the RF test connector should be 15dBm +/- 4dB. If not,follow the procedures in the "Transmitter RF Troubleshooting Procedures" sectionon page 18.3. Using a voltmeter on DC, probe the detector output at C7313. The voltmetershould read approximately 1.4V. If not, replace N7300. (See "Tx RF Test Points" onpage 23 for test point locations and common power and voltage variations.)